Lewis Carroll(click on names to see more mathematical fiction
by the same author)

...

The sequel to his somewhat popular book "Sylvie and Bruno" never
achieved the popularity of the original. This lack of success may or
may not be related to Chapter VII (entitled "Mein Herr") of the book
in which (while sharing some tea) the characters discuss the
production of a projective plane by gluing the boundary of a disk to the boundary of a Mobius strip.

Contributed by
Moses Klein, University of Wisconsin

"The entertaining Klein bottle passage certainly isn't the
only mathematical chapter in the book. There's also one exchange in which Bruno
estimates a crowd of 1004 ("I'm sure about the four; it's the thousand I'm not
sure about") which I occasionally cite to explain significant digits. This book
is Lewis Carroll at his finest: subtly sophisticated, playfully presented, but
undeservingly underappreciated."

(Thanks to Victor Jiminez Lopez for pointing out an error on this page that I have now hopefully successfully corrected and I will not repeat in order to avoid further embarrassing myself.)